Remote Backup using EBS 7.2 is Very Slow
Hi,
There are two servers n1 and n3. The l8 auto loader is connected to n1.
I have installed EBS 7.2 to take backup file systems of n3 to the autoloader connected to n1. Both n1 and n3 are connected but are in different domains. n1 is configured as the server and n3 is configured as the client.
The backup process is very slow and is backing up only upto 5 Mb per minute. I want to backup 85gb of data and at this speed it would need up to 5 days. We are not in a position to afford so much downtime.
Note: When I start the EBS using the command
#nwadmin -s n1 &
I get an error saying that "reverse DNS lookup has failed" but then the GUI starts and runs normally.
Any suggestions.
David
[1088 byte] By [
] at [2007-11-25 22:42:20]
# 1
more information:
I tried to ftp from n3 to n1 but the writing speed is as low as 4mb / minute. This is extremely slow.
I did the traceroute in from n3 to n1, it shows no problem with the connection.
Here are the outputs of the trace route files:
n3# traceroute localhost
traceroute to localhost (127.0.0.1), 30 hops max, 40 byte packets
1 localhost (127.0.0.1) 0.201 ms 0.063 ms 0.053 ms
n3# traceroute <ip of n1>
traceroute to <ip of n1> (ip of n1), 30 hops max, 40 byte
packets
1 n1 (ip of n1) 0.334 ms 0.211 ms 0.198 ms
This shows that there is no problem with the network card either.
Any expert advise?
David
at 2007-7-5 14:21:08 >
# 2
The reverse name lookup fail would be caused by a missing entry in hosts (or DNS) for one of the servers - or one of the servers not using DNS when it is expected to do so.
Failure to do reverse lookups can cause delays in connecting so I would check that both servers know about each other - can each server ping the otehr (and itself) by name?
at 2007-7-5 14:21:08 >
# 3
Well, I am a beginner. Can you tell me how to check if DNS is configured in both the servers?. However, I am able to ping using the server hostname from both the servers. Both the servers have the entry of each other in /etc/hosts file and ./rhosts file.
One more thing: I tried to ftp n3 from n1.
<a href="mailto:root@n1" target="_blank">root@n1</a>#ftp n3
here the put command works very fast 4000kbps but the get command is extremely slow 10kbps. This shows that the data flow from n1 to n3 is fast but the data flow from n3 to n1 is very slow.
n1 and n3 are in a different domains.
David
at 2007-7-5 14:21:08 >
# 4
To check for a server using DNS you will need to check the nsswitch.conf file and also, if configured, resolv.conf.
at 2007-7-5 14:21:08 >
